Separation of messages. Introducing Wino.Messages library.

Wino.Messages/Mails/SaveAsPDFRequested.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Wino.Messages.Mails
+{
+    /// <summary>
+    /// When mail save as PDF requested.
+    /// </summary>
+    public record SaveAsPDFRequested(string FileSavePath);
+}